Quite often there's a great deal of disagreement within the executive branch about what we should do. Some cases are pretty straightforward, but a lot of them aren't.

Brett Kavanaugh is a brilliant, brilliant judge and one of the most-distinguished conservative jurists in the country.

There was only really one time that I had a substantive interaction with the president [Barak Obama] directly, and that was in 2013 when we were deciding whether to file a brief in the first gay marriage case, the Perry against Hollingsworth case. That was a weighty decision about whether the United States government was going to come in and say that heightened scrutiny ought to apply and some state bans on same-sex marriage ought to be unconstitutional. And that was the one time in my tenure where I thought I ought not make this decision without talking to the president.

Watch what happens on Twitter. One thing leads to another very quickly. And in an ironic sense, even though it's such a democratic form of communication, there's a funny way in which it leads to a hardening of a conventional wisdom much more quickly than might happen if you were reflecting on it a little more.

Justice [Sonia]Sotomayor said, "Let's talk - you want to talk about the tax power."And I got like a 10-minute run on the tax power. And, boy, was I glad I did because I was able to get across this idea that, yes, this is a narrower ground on which you can affirm it. And I think everybody agrees. I think even the dissenting justices ultimately in the case agreed that, if Congress had expressly called it a tax, it would be indisputably constitutional.

Sometimes one of the justices, because they're, you know, they're brilliant lawyers themselves, can put the question in a particular way so that, even if you've prepared to talk about the topic, the question is put in such an excruciatingly difficult way that there's just no good way to handle it.

Quite often there's a great deal of disagreement within the executive branch about what we should do. Some cases are pretty straightforward, but a lot of them aren't.